This is basically a rare chance for 2, 3, 4, 5, ect., to be stacked (Like spider jockeys). I'd say around 1% when any mob spawns%s (when stack spawns)-Regular Stack-30%1 Enraged in stack-25%2 Enraged in stack of 2-10%All enraged in stack (3+)-0.7%Momemtus-Marlix stack-0.03%Uberstack (10+ mobs, 50% must be enraged)-1%Stack of passive mobs-if a stack with a passive mob on bottom spawnsHope you like!